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. Author manuscript; available in PMC: 2019 Jan 1.
Published in final edited form as: Ultramicroscopy. 2017 Aug 19;184(Pt A):94–99. doi: 10.1016/j.ultramic.2017.08.007

Fig. 5.

Fig. 5

Examples illustrating the progressive degradation of the density map that occurs when it is convoluted with the 3-D point-spread functions shown in Figure 4. The structure of a small portion of the polypeptide chain of tubulin (PDB ID: 1JFF), consisting of the sequence Lys-Met- Ser-Ala-Thr-Phe-Ile, is shown on the left-hand side of this figure. Density maps produced for the same portion of the structure after it has been convoluted with the point-spread functions for points located at radial distances of 0, 125, 250, 500, and 750 Å, going from left to right.